Stuffing box



Oct. 16,1934. N L. BL 1,976,916

STUFFING BOX Filed Jan. 23, 1935 INVENTOR. Norman L B/ack ATTORNEY.

Lessors mama E i'eeh, rixna'lover, E ma. Ammmim 193s, iieriai no. 552373 3 Claims.

My invention relatesto improvements in stufling boxes.

The object of my invention is to provide a plurality of packing elements spaced apart in a stuffing box by springs which compress the packing,

and means to compress the springs.

A further object of my invention is to provide means for the introduction of oil to each packing element. 1

A still further object of my invention is to provide springs concentric to the rod and supported in such a way as to avoid contact therewith.

These and other objects will hereinafter be more fully explained, reference being bad to the 13 accompanying drawing forming a part of this specification. and in which like characters will apply to likeparts in the different views.

Referring to the drawing: v Fig. l is an elevation of the stniilng box, partly 2c in section for convenience of illustration.

Fig.2 is a sectional view taken on line 2- -2 in Fig. 1. a 3 is a plan view of the gland washer.

Fig. 4 is an edge view-of the washer and frag- '25 mental-y portion of the spring attached thereto.

My invention herein disclosed relates to. a studing box'ccnsisting of a body portion Leach end of whichisthreadedasatAandRandhasan enlarged portion 2 polygonal in form and to so which a wrench may be employed as turning means therefor by which means the threaded portion B is brought to engagement with fitting 8. The said fitting is adapted to connect by threaded engagement with pipes 4 and 5. Pipe 4 will be u assumed for illustration as that of a casing commoniy placediin oil wells while pipe 5 is a lead to a storage tank or other place of deposit for oil being pumped from an oil well, the well and storage means not show! in the drawing.

The said stufiing box is preferably made cylin-' 1 dricaliniormandaxiaily boredtoreceivearod 8 slidably engaging therein with a smooth running fit longitudinally. I

In the bore near the lower end of the stumng box is a shoulder? at which point the bore varies from a greater to a lesser diameter. The greater diameter receives in working position springs 8, 9,'and 10 held concentric to the rod in such a way as to avoid contact therewith.

Positioned between the said springs are fiber packings 11 composed of a piurality of annular members stacked upon each other and adapted to close the space between the inner wall of the stufiing box and the rod. Above and beneath each packing is an annular washer 12 adapted to fit around the inside wall of the body portion to avoid contact with the said rod as the opening therethru is of greater diameter than the rod, by which means the packings are uniformly com- 7 pressed by their respective springs and each 00 spring is attached to its respective washer by the insertion of an end portion thereof thru an aperture positioned in the washer and peined as indicated at 13 to avoid removal therefrom.

Diametrically positioned with respect to the 8 connecting point of the spring is an aperture 14 thru which oil will pass and exude thru the packing as lubricating means for the reciprocating movement of the rod. i

It is now shown how contact of the spring with the rod is avoided as the said springs 8, 9, engage in close proximity to the greater diameter of the body portion. Spring 10 hasone end socured to its respectivewasher while the other end is seated in the outer end of cap 15. The said 7 cap 15 threadediy engages on the threaded portion A of the body portion and has in the head end a beveled portion C to concentrically position the other end of the last said spring seated in the head as at D which is transverse to the axis of the body portion.

To compress the packing to snug engagement between inside wall and rod, the said cap .is screwed downward compressing the springs which in turn act upon the said fiber packings. 3a The cap is axially apertured to receive the polish rod When the stufiing box herein disclosed is employed in connection with the so called polish rod of an oil well pump the oil is free to fill the 90 spaceoccupied by spring 8, but is stopped by the adjacent packing positioned on the spring and to introduce oil to the space occupied by spring 9. I have arranged a by-pass consisting of an L-shaped pipe fitting 16 threaded-1y engaging thru the body portion in communication with the bore thereof in close proximity to its lower end and another similar fitting 17 engaging in like manner communicaiing with the space occupied by spring 9. The said fittings are connected by nipples 17', 18, and 19, there being a union 20 as connecting means for nipples 17' and 19, and a check valve 21 as connecting means for the adjacent ends of nipples 18 and 19, by which means the accumulation of oil in the space of spring 8 is forced upward thru the by-pass to the space of spring 9 filling the same as oiling means for each of the packing elements. An extension of the Icy-pass may be made for the 1m ros introduction 01' oil should a greater number of spaced packing elements be arranged.

It is now clearly shown how packing thus arranged will seal with great efficiency about a reciprocating or a rotating rod, and while I have shown and described the spring connection to the washer by inserting an end portion thru an aperture and peining the same, I do not wish to be confined to such alone as the end of the,

spring may abut with the face of the washer and be secured by welding. Furthermore, while I'have shown and described the, stuiling box in connection with a polish rod pumping oil, the

.same may be employed otherwise whether the cap threadedly engaging on the upper end oi thev said body portion, the head axially bored, an annular bevel at the intersection of the head and wall of the cap to concentrically position the.

end of a. coil spring seating on the. head, the stuillng box having a polish rod extending through the bore, a plurality of springs in the bore and packing spacing the springs from each other, the packing fitting snugly around the rod and to the wall of the bore, the adjacent ends 0! each spring having a thin washer secured thereto to engage on the packing compressing the same uniformly when compressed by their respective springs when the cap is screwed downward, the outer end of the lower external spring seating on the shoulder while the outer end or the upper spring seats on the head within the said bevel, a 'by pass communicating with the bore above and below the lower packing for the purpose specified. 2. Ida stumng box of the class described comprising a body portion axially boredand having a polish rod extending therethru, the bore reduced to form a shoulder at its lower end and to receive the rod with a smooth running fit reciprocatingly. the enlarged portion or the bore as an annular working chamber, the lower end of the body threaded to engage with the casing 01' an oil well, the upper end being threaded and a headed cap to threadedly engage thereon, the head being bored to receive the polish rod, an annular internal bevel adjacent the inside periphery oi the head, and a spring concentrically positioned in the head by the beveled portion, and a spring seated on the shoulder in the other end or the bore and an intermediate spring, a packing between each end spring and the intermediate spring. and means carried by the spring to engage on the upper and lower end of each packing and a by pass communicating with the working chamber above and below the lower packing forthe purpose specified.

3. Ina stufling box, consisting of a body portion of considerable length and being bored axially but varying in diameter, the greater diameter forming an annular working chamber for springs packing I and lubricant, the lesser diameter being approximately the sizeoithe polish rodwhereby a shoulder is iormedattheupper end-o1 the reduced bore, a coil Bil n -oi short length surrounding the polish rodand seatedv on the shoulder and having a'washer on the otherend secured thereto, a vflber apacking placed on the washer as aseal between -thetrod and the wall of the bore whereby an oil chamber is provided in the space or the said spring, another spring having a washer on each endathereoi' to seat on the packing and another packing placedonthe said spring and another spring having a washer secured to the lower end thereof to seat on the last and packing are tensioned as desired, a by pass I communicating with a space below the first said packing and the space between the two said packlngs by which means theupper packing is lubricated asthe polish. rod reciprocates longi- Norman l BLACK; 

